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D( x )
(M^2)/(n^4) = 0
n^4 = 0
(M^2)/(n^4) = 0
(M^2)/(n^4) = 0
M^2*n^-4 = 0
x należy do R
n^4 = 0
n^4 = 0
n^4 = 0
x należy do R
x belongs to the empty set
((M^2)/(n^4))^-2 = 0
x belongs to the empty set
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